The BIS published their trienniel survey today which shows a change in the balance of OTC business activity to the US from the UK:
The jump in the US from 2013 to 2016 is significant, but doesn't correspond with the drop in the Uk figures - so someone lost out, maybe France, Australia and Japan?
The overall flow of OTC business remains unabated with a big drop in EUR and a jump in USD instruments.
The full details are in the BIS report attached below.
BIS Press Release on the "Triennial Central Bank Survey of interest rate derivatives turnover in April 2016"